Yes, low priority visual glitch, but annoying nonetheless.
The more annoying thing is when multiple trees are being researched, it will club all the workers together into one set and display the shortest university research time for all the workers. For example: University (10) - 3h5m when it should actually be University (3) - 3h 5m, University (4) - 3d1h, University (4) - 5d21h, so that you know when the next set of workers is actually coming free which is the intention of that bar anyway. As it currently stands, I have to click the university everytime to know how many workers are actually going to free up in the time indicated.