Why does Helm in pop-up use different font?

Hello Emacs fans, ​ after a long long time of using Helm in the derived window, I tried to use Helm as pop-up. I was surpised, that in this situation Helm uses different font. (please, see images here or on \[gallery@Postimawes\]([https://postimg.cc/gallery/hXdhXDs](https://postimg.cc/gallery/hXdhXDs)) ). [Helm in \\"standard\\", divided window.](https://preview.redd.it/up7xwjgs92191.jpg?width=1656&format=pjpg&auto=webp&s=2eb4439bb53c80fb1624bb552a80d3dc695d1885) [Helm as pop-up, actually a new frame.](https://preview.redd.it/ahclzngs92191.jpg?width=1022&format=pjpg&auto=webp&s=9a6c72ec6b1dcba2145bf62350b212770f8705e9) ​ So I checked the settings in `list-faces-display`. There is not any font like in this helm pop-up frame. ​ Also I checked: ​ `(add-to-list 'default-frame-alist '(font . "Iosevka Term-14:normal"))` ​ This is a proper setting (I think) as new opened frames (like C-x 5 b) have correct font. ​ Also I tried checked and uncheck the `Inherit` property in default font settings. ​ No luck. ​ Where can be definition (hidden) of the font of pop-up frame? ​ Thanks for any idea.

`describe-face`?

Hm, only option, which looks suitable, is `helm-M-X-key`, but actually any setting of this face doesn't help. Maybe for pop-ups is used another face, but which (this is why I relied on `list-faces-display`, which invokes the preview of all faces)?