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Nice to have you here in the Community forum, @iezziphoto.
I can guide you on how to align your check.
To get started, download the latest version of Adobe Reader this will control printing checks in QuickBooks Online (QBO). Then, set it as the default PDF viewer for your browser.
Once done, try to print checks again. See if it works. If not, let's use the fine-tune alignment. Here's how:
For more information about how your checks print and how to fix alignment for preprinted checks, see below links:
Fill me in if you have additional questions when printing checks in QBO. I'm always here to help. Take care, and have a lovely day.