Hello,
1) IE is out of date browser, new header builder includes styles that are not supported by the old browsers like IE. Did you check the statistic, how many of your customers use this browser?
2) Edit the title and use custom styles to change font-weight, color etc. We made changes at this page as example http://144.208.71.24/~wwwlifebiotechco/rd/
3) Enable option https://prnt.sc/pk1913
4) It’s because of your content that is hidden for the desktop but visible for the mobile http://prntscr.com/pk1cvy I don’t know why did you add so many empty spaces elements.
5) Probably you edited that page because I don’t see the text there, the only image, but the reason was the same – hidden column for the mobile http://prntscr.com/pk1e9h
6) Don’t see problem with this http://prntscr.com/pk1hbm
7) Don’t see problem with this http://prntscr.com/pk1hrw
Regards