'On ne peut pas stationner ici' is 'You cannot park here'...
The you here applies to everyone, in other words, it is forbidden to park here.
It is a bit like:
On ne sait jamais ce que nous réserve l'avenir = You never know what the future holds
Which is a saying for a truth that applies to everyone.
Not sure what you mean about the verb tense not matching...
All 3 are correct - I just tried the question myself and it accepted all 3.
With these multiple selection questions, I sometimes find that one of the answers I was sure I had selected is missing. Then it can be confusing when you compare the correct answer with what you supposedly entered. Maybe that's happened to you.
I have a feeling there may be a bug somewhere - perhaps if you click on the answers too quickly.
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