examples in footnotes in examples cause tectonic shift in other chapter

[stefan11]

\eal
\ex Peter looks like he's tired. / \# Mary is coming.
\ex There looks like there's going to be a storm.\footnote{
From \citet[\page 407]{Sag2007a}. The full picture is a bit more complicated, since the bound pronoun in
the finite complement is not necessarily the subject, as pointed out to me by Philip Miller
(p.c. 2021), on the basis of naturally occurring examples such as: 
\eal
\ex He looks like someone took him out back and beat the crap out of him. (COCA)
\ex He is the shiniest person I have ever seen. He looks like his mother polished him before she sent
him off to school. (COCA) 
\zl
I do not go further on this particular case.
}
\zl

This code somehow does something having effects outside of the example. It caused taking too much space on a page in the binding chapter (around example (38)).

I circumvented the issue by shifting the part of the footnote with the example to the main text, where it should have been in the first place.

[Glottotopia]

no assignments without clear instruction of what the bug is, how it can be reproduced (MWE) and what the requirements for a solution are.