This is why word processors shouldn't be used for tables (unless you're actually inserting a table, but even then). The problem is that the tab size is a little bit different in all these different programs, and when you switch from one to the other, problems can occur.
For example, you create a "table" with columns, and each column is separated by two tabs. It's all fine, although there is one entry that was a bit longer than the rest. When you switch to a different word processor, the tabs are a little bit shorter, and that long entry pushes into the next tab zone. So now that row is offset, and to correct it you need to either delete one of the two tabs or add tabs to the rest of the rows.
Solution: Use a spreadsheet editor (Excel, Google Spreadsheet, whatever). Or insert a table into your document.
Best of luck!