What could be causing this?

I have ran into an issue with every print starting fine then it begins to shift the print. The adhesion is good and it is firmly stuck to the heatbed properly. However, after 5-10 or more passes of the print head it seems to shift in the same direction (towards the rear). These are a test of Benchy that I ran because it has come out before perfect.

This is usually caused by a loose ‘Y’ belt. Check the tension by turning the knob.

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Thanks for the advice, I will try there and post the results.