first of all: Welcome to our Tape community! Happy to see you here.
Indeed what @1F2Ns shared could be useful to you - in Tape calculation fields, you can leverage the full power of HTML and CSS next to Markdown, which allows you to create custom stylish elements such as headers without needing to use external images. Of course you can stick with your existing solution, given that you know it well and it gets the job done.
Regarding the issue and the screenshot you shared: Could you elaborate a little more about the circumstances, you mentioned βa few hours laterβ? No changes were made to the formula and to the record in between? Existing calculations should never just vanish.
It would be important for us to understand what is going there, and whether it is an issue on our side.