See image below for what I'm calling a 'footplate." The bit that holds onto the stem of the finderscope holder. If this is loose or has been knocked a bit it wont allow you to align the finder nicely with the screws, the screws should only be for fine adjustment. From the problems you're describing it sounds to me that you need to look at this first. It should be bolted on with two bolts. Fiddle with them as required.
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