Ownerrez and Houfy Calendar issues

I keep my master calendar in ownerrez and I just exported my calendar to Houfy. However, not all of my blocked dates are showing up in my Houfy calendar. Dates after 4/6/20 are showing up as unavailable, as I would expect, but any blocked dates before 4/6/20 are showing up as available. Anyone have an idea of what could be going on here?

I take it you've followed our instructions here?

https://www.ownerrez.com/support/articles/channel-management-calendar-import-export-houfy

If it still isn't working correctly, please take screenshots of the bad Houfy calendar, and specify the ORB numbers of the blocks in OwnerRez that aren't appearing in Houfy, and send in a support request to our Helpdesk email.