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It’s mis-aligned, that much is obvious. As to the cause... you’ll have to twiddle various things till you find the culprit. The strongest suspect is indeed the primary mirror alignment so start with that.
FWIW the budget Newtonians like yours do not stay perfectly aligned for long periods - so get used to the idea of checking it visually on a bright star - and if need be, adjusting- before adding camera - or the shots will be a waste of effort. That yours lasted a year without tweaking is unusual. Thin metal bits including the tube distort, and wood/mdf/chipboard parts swell and warp as humidity changes.
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