When pasting data from Excel, each row comes in with a Forced Line Break marker at the end, instead of an End Paragraph marker. This is a recent change within Indesign, as you used to be able to paste from excel into a table in Indesign, maintaining the proper rows and columns. Now when you paste in the same information, it doesn't recognize the end paragraph, and tries to put all the data in one row.

The same issue has been found when pasting text from Microsoft Word into Indesign - instead of End Paragraph markers, you get forced line breaks. This is a nightmare when trying to manage intricate text and utilize various style features.