I've run into similar quirks with different text editing software. It can definitely throw you off when trying to make simple edits! One thing that might help is checking if there's an update available for Textmaker. Sometimes, these updates fix bugs that cause these kinds of issues.
Once I had a similar problem with a different software, and updating it actually solved the problem completely. It's worth a shot before diving into more complex troubleshooting. If that doesn't work, you might want to consider trying out Microsoft Office Professional Plus 2021. I've heard good things about its editing capabilities and stability, which could be a solid alternative if you're looking for reliable performance.
Once I had a similar problem with a different software, and updating it actually solved the problem completely. It's worth a shot before diving into more complex troubleshooting. If that doesn't work, you might want to consider trying out Microsoft Office Professional Plus 2021. I've heard good things about its editing capabilities and stability, which could be a solid alternative if you're looking for reliable performance.