Hello ricefamily1,
Thank you for posting in Microsoft Community.
Based on the description you posted, you are having issues with the cut, copy and paste function in Excel Online.
We tried to test CNTRL + X to cut and CNTRL + SHIFT + V to paste value with formatting using excel online on different windows computer but the same issue happens. Also when we tried to cut the data the function paste special, formatting are also grayed out and will only be available with copy and paste. So this could possibly be a feature limitation or a new update with Excel online. I suggest to send a feedback on this link Excel · Community (microsoft.com) to Microsoft Developers so they can help us correct this issue.
The issue with copy and paste could be because of the formula or formatting added on the file you are working. Please try to create a new Excel workbook and test copy and paste to help you isolate the issue.
Please let us know if you have further questions.
Regards,
Nhiel T.
Microsoft Moderator