Saving file removes code

I have a code file written in c which is not part of a project.

All my functions are collapsed and only the function i'm working on and the function below that are uncollapsed.

In this file I have a code segment at which I put an if statement around, after which I call ctrl-a, ctrl-i, ctrl-s to re-indent the code and save it. But when I call the ctrl-s some of my other code gets removed as is visible in Error2.png, the left side is the original code and the right side is the code after ctrl-s. I can reproduce this problem on my system

I had this problem multiple times on the same file at different locations in the code, as you can see in Error.png where the problems are indicated with a blue line under it at other locations in the code file.