Also worth asking…  Do you have tempo sync enabled on the H90 Looper preset?

https://cdn.eventideaudio.com/manuals/h90/1.8.6/content/algorithms/looper.html

“…Tempo Sync Footswitch Quantization
 
MIDI Clock is made up of a series 24 “ticks” per beat. Tempo Sync quantizes many of the Footswitch actions either to the next MIDI beat or the next MIDI tick...”