Your workout compliance looks good so it doesn’t look as though your FTP is set too high.
Can you tell us what FTP values the ramp tests gave you each time? I can’t see that info on the calendar.
One thing to note, personally, is that you could work on improving compliance of the plan itself. You should see gradual increases in TSS each week, with a low TSS week for your recovery week. These incremental steps help build you up. I don’t think that is to blame for FTP going down, but it’s something that may help, especially as you continue to get stronger.
Check out this thread for lots of discussion on why the ramp test doesnt work for everyone. However, note that if you are doing the ramp test everytime, then that shouldnt explain your discrepancies in FTP either, unless you are making huge shifts in anaerobic capabilities.