Issue appear only in Chrome.
When clicking next-arrow font (on next slide) become a little bit blurred
it is not the first time i saw this issue.
Why it works like this and what should be done to does not face a similar problem?
normal font: screenshot
blurred font after next-arrow clicked: screenshot
it's not a bug with BxSlider or your code. it's a Chrome bug, which is DirectWrite engine for newly version of Chrome, that may occur on some windows's users. to turn it off, please check up this link Fixing blurry font in Chrome