The letter T in CRT is too small below (source here). This is the only letter in the alphabet that exhibits this problem in that context. Alas, it renders so ugly that I've been forced to resort to alternatives such as the $\!\bmod\!$ Distributive Law (just kidding, but it is a bit hard on my eyes).
On a $64$-bit Win$7$ computer, accessed through a remote terminal connection, using FireFox $66.0.5$, I can reproduce the problem, but only at $100$% zoom. At $90$% or $110$%, it looks fine. However, on the same machine, using the same version of Chrome $74.0.3729.131$ as you have, the problem doesn't occur at $110$%, $100$%, $90$% and $67$% zoom, but it does happen at $80$% & $75$% zoom. On a $64$-bit Windows $10$ machine, with a $1280$x$1024$ resolution, using Microsoft Edge version $44.17763.1.0$, the problem occurs at all zoom levels I tried, i.e., $50$%, $75$%, $100$%, $125$% and $150$% (but it seems to be minimal for the $125$% & $150$% zoom).
If need be, I can try different OS's & browsers, but I believe what I've described above shows there is no simple pattern and, perhaps, no simple solution. Overall, I suspect it depends on various factors, including the fonts being used, the screen resolution, the MathJax renderer, the browser, the OS, etc.