Source Editor saves are destroying <b> and <i> text

[marcus.erlemann]

Dear Teams,

after saving (apply) or even only entering the code of pages via source editor, all words & phrases using headlines, bold text or cursive are broken automatically (even already in the normal editor view you can see that i.e. "Facebook is getting bigger" is broken into "Fac ebo ok is get ting bigg er".

The code instantly also looks like i.e. :
<ac:rich-text-body>
<ol>
<li>
<p>Go to https:</p>
<strong> <u>/</u> <u> </u> <u>d</u> <u>e</u> <u>v</u> <u>eloper</u> <u>s</u> <u>.</u> <u>f</u> <u>acebook</u> <u>.</u> <u>com/</u> <u>t</u> <u>ools</u> <u>/</u> <u>debug/</u> </strong>
</li>
<li>
<p>Enter the URL into the Sharing Debugger and click <strong>Debu</strong> <strong>g</strong>.</p>
</li>
<li>

-> Is there any way to prevent that? The text was clear before and only by "entering" the editor, it instantly changed, event backup to previous version is affected.

Thx & best
Marcus