Text Add Tool Reversed
i was adding text to a PDF via the Add Text tool. it suddenly started to type backwards and across the page with large gaps between the letters. i restarted my computer and the problem persisted in the same file. i did nothing to change the settings when this happened--it was 100% spontaneous. i had no way to undo this bug and i had to create a new document to get it to stop.
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Grace Sifuentes commented
This is the solution for Adobe Acrobat Pro 2017, so you can try it on the software you're using.
When editing a document, the Format tool to the right has a box that shows AV and an arrow underneath it. If the number in that box is not zero, change it to zero. This fixed my problem! I stumbled on the solution, but I hope it helps others.