Something drastic on X

I've just run the input shaper for the first time in a little while, and I've got some drastic issue on the X axis that I'm not sure about. I've given everything on the toolhead a bit of a wiggle and it seems relatively stable - is there something obvious I'm missing? thanks!
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harsh-harlequin
harsh-harlequin11mo ago
first measure the belt tension and post the graph