Does the font shrink on mobile?

Question

css

I am writing a miniapp in VK.
In the browser, through emulation, the font is displayed correctly, on the phone, the font itself decreases.
Why can this happen?

SCREENSHOT

On the screen - directly on the phone devtools (ie not a mobile emulator) eruda. I installed a font-size, it's not visible here, but there is also !important (I tried it - it didn't help). The font is installed only in this place. As a result, in the computer - a different font size (well, on the screen, respectively, you can see that it is smaller)
there is a viewport tag in html.

UPD: Found out that this is ONLY in the office. client vk. Those. miniapp you open vk - the font is cut. Browsers are fine