row 7 of my spreadsheet is half missing, all other rows are okay

If you are using Apple Numbers, the Numbers User Guide for iPad may be helpful to you:

https://support.apple.com/en-gb/guide/numbers-ipad/welcome/ipados

If you are instead using Microsoft Excel with your iPad, then the Excel help pages will likely be useful:

https://support.office.com/en-gb/article/excel-for-ipad-help-6b5dc2e1-a8e4-48e6-bb69-cb9a3964bc91

Is this spreadsheet in Apple's Numbers app, Microsoft's Excel app, or some other app?

Hello,

Can you please elaborate more on your question?

Writing an effective Apple Support Community post