Duplicate stylesheet/ui files in filestore folder every minute

I have noticed, since our upgrade to v10.2.2.4296, that a new set of files is automatically generated for each site theme we have and stored in the filestore folder roughly every minute.  This is causing the filestore folder size to grow quite large. New folders and files are re-generated with the same exact content...

Here is an example of the top couple files ordered by creation date - note that the file sizes are exactly matching, and no one is making any changes to them:

FullName Attributes Length CreationTime
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867631261249913\https\sitename\443\tablet.less Archive 172696 2019-02-25 23:33:15.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867631261249913\https\sitename\443\handheld.less Archive 456684 2019-02-25 23:33:15.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867631261249913\https\sitename\443\print.css Archive 5943 2019-02-25 23:33:13.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867631261249913\https\sitename\443\screen.less Archive 464433 2019-02-25 23:33:12.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867631261249913\https\sitename\443\global.less Archive 61733 2019-02-25 23:33:10.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867631261249913\https\sitename\443\analyticswidget.css Archive 9725 2019-02-25 23:33:10.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867631261249913\https\sitename\443 Directory 0 2019-02-25 23:33:10.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867631261249913\https\sitename Directory 0 2019-02-25 23:33:10.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867631261249913\https Directory 0 2019-02-25 23:33:10.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867630896240813\https\sitename\443\handheld.less Archive 456684 2019-02-25 23:33:05.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867630896240813\https\sitename\443\tablet.less Archive 172696 2019-02-25 23:33:04.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867630896240813\https\sitename\443\print.css Archive 5943 2019-02-25 23:33:02.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867630896240813\https\sitename\443\global.less Archive 61733 2019-02-25 23:33:00.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867630896240813\https\sitename\443\analyticswidget.css Archive 9725 2019-02-25 23:33:00.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867630896240813\https\sitename\443\screen.less Archive 464433 2019-02-25 23:32:59.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867630896240813\https\sitename\443 Directory 0 2019-02-25 23:32:59.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867630896240813\https\sitename Directory 0 2019-02-25 23:32:59.000
D:\wwwroot\filestorage\uifiles\h\0000000023d59ec8\5e8e1650092c434295fc1226a66a944e\s\00000000000000000000000000000000\stylesheetfiles\636867630896240813\https Directory 0 2019-02-25 23:32:59.000

Is this a known bug? Is there a way to clean up unused files to shrink the disk usage?

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