I can't figure it out, but some bikes just do this filter-sucking thing.
On the last bike I owned I, and every owner on its own sub-forum, found that by 3,000 miles the filters we had been carefull to not overtighten became stuck on the bikes. These were fully exposed filters we could grab with an entire hand (or gloved hand, or what-ever to get extra grip on the filters), yet filters we could test-remove with one hand when newly installed were nearly impossible to remove when used.
Is it some type of vacuum-lock? Hard to believe since the crankcase is open the minute we drain the oil out or take off the filelr cap.
Are modern filter gaskets either swelling too much (don't look like it) or glueing the filter to the case?