when testing my custom nations mod events for democracy,fascism and communist taking power kept firing and i couldnt select any other mobilisation law or economy law 

Could you explain what you mean with democracy/fascism/communism a bit more please?

For the mobilisation & economy law, you will either need to recreate the ideas from scratch, or you will need to copy the "_economic" ideas file from the base game to your mod, and replace anywhere it says "fascism" or "communism" in the file to whichever ideologies should have the same capabilities (e.g. if totalitarian should be the same as fascism, in terms of what economic/manpower laws should be allowed, then swap those around)

the events for supporters marching on the capital and things like this keep firing 

Would you be able to get the event ID of a few of the events which are firing, as I'm not sure which ones you're on about?

Running this in the console when an event is active should give you the id: 

debug_show_event_ID

If it doesn't work, screenshots of the event will be alright too.

I have the same problem:

The events are:

poltical.23, poltical.22 and poltical.21 respectively. 

They fire up and neither buttons have effects, only that they fire again every week.

If you re-export your mod now, it should export with a modified version of the political events file, which should cause those 3 events to never be valid; meaning they shouldn't trigger.

Let me know if there's any others which seem to be causing issues.