Hardly noticeable but I still decided to report it - just noticed: at Find the number of boolean functions of n variable that satisfy the following condition one sees this

The second $k$ below is obviously spurious...

PS Added the link as suggested by quid; the bug is not always there however, right now it reappeared after I reloaded that page.

PPS On Windows 10 pro I see this in Waterfox 44.0.3 and Chrome 48.0.2564.116 m (64-bit), have not tried any other browsers

**Later** - seen another instance of the phenomenon in the "Related" column of Is this a model for $K$-theory of a triangulated category? which might shed some light on the nature of it. Result looks like

while the actual content of the garbled part should be "Proof that the homotopy category of a stable $\infty$-category is triangulated"

Thus the whole thing is broken into columns in a wrong way somehow.

Also as pointed out by Martin Sleziak in a comment below this also happens on math.SE and physics.SE. At links provided by him there is a suggested solution by Davide Cervone who seems to be one of the developers of MathJax

`<span style="font-family: MathJax_Math; font-style: italic;" id="MathJax-Span-8" class="mi">k</span>`

which itself is inside`<span id="MathJax-Span-7" class="mrow">`

which is inside`<span style="position: absolute;">`

which is inside`<span style="display: inline-block; position: relative; width: 0em; height: 0px; font-size: 120%;">`

which is inside`<span role="math" id="MathJax-Span-6" class="math">`

which also holds the correct piece (with correct $k$) $\endgroup$ – მამუკა ჯიბლაძე Feb 29 '16 at 13:12`inline:10`

from`.MathJax span`

but I have no idea how to get any further information $\endgroup$ – მამუკა ჯიბლაძე Feb 29 '16 at 13:14`class="MJX_Assistive_MathML"`

I'm hoping to find out if those styles (a section with the name of the class) are being overruled, in particular heigh, width, clipping etc. They would be struck out in the list and some other section in that panel would indicate what stylesheet is overriding them. $\endgroup$ – Peter Krautzberger Feb 29 '16 at 13:46`<span role="presentation" class="MJX_Assistive_MathML">`

, of about 16 lines, 5 towards the end, 4 of those marked with "Invalid property value", namely`-webkit-touch-callout: none;`

,`-khtml-user-select: none;`

,`-ms-user-select: none;`

and`user-select: none;`

. It is fourth in the list, the first being`element`

with no entries, the second`.MathJax span`

with some lines overruled too, the third`.MathJax *`

with two of five lines also overruled and marked "Invalid property value", then some other stuff... What must I seek? $\endgroup$ – მამუკა ჯიბლაძე Feb 29 '16 at 15:54