I assume you have not yet released the seat back.
Far too early for drastic butchery. Please be patient, the mechanisms on these seats are quite robust and while it is true there is a very small chance that something is actually broken there is a far far far greater chance the malfunction is caused by something simply being out of kilter.
Many respondents point out the need for the base of the seat to be locked square to the floor. It should be like this
View attachment 44013
I will only do my best to assist further if you answer direct questions. If you feel a question is irrelevant please do not ignore it, the person asking may be aware of something you are not, remember we cannot see your seat.
Let's get the seat base question resolved.
IS THE SEAT BASE FLUSH TO THE FLOOR AS PER PICTURE?
Andy