Hi there,
During homing process, plate is pushing nozzle up for a bit then it stops.
There is sensor in SE, and if it works fine then it stops plate from moving.
Of course, nozzle itself must be able to freely move.
But if build plate push nozzle up too much (and ram into plate itself) then look like your sensor is not working properly.
If so, you will have to think about replacing SE, I'm sorry.

Use latest firmware 1.7 together with Destop 3.7

Regards,
Roberto