Assuming we can rule out the possibility that you’ve accidentally adjusted the rebound setting somehow and havent been able to get it back to where it was with the adjuster, then yes logically you must have upset something when pushing the damper in by hand.
If you’re confident, try a damper service. Shouldn’t be that much harder than the lower leg service if you’re comfortable doing that.
Or take it to someone that knows what they’re doing and pay them.