According to this
yes, ActiveSync is enabled on both, but “SOGo will take precedence”.
"WebTop and SOGo can be installed on the same machine.
ActiveSync is enabled by default on SOGo and WebTop, but if both packages are installed, SOGo will take precedence."
EDIT:
Can you reproduce the issue that you found after you remove WebTop5, as @stephdl suggested?
Will you run config show sogod after remove WebTop5, without any other commands, to see if ActiveSync for SOGo remains enable?
TIA,
Gabriel