Text content based on expression randomly glitches

[Ondrej5FCA]

I've set up a simple timer counting from 30 to 0 seconds. It works fine except the actual rendering of the numbers. Sometimes, at the end of a second, the number shifts it selves to the side before transitioning into the following one. It's a matter of 1 frame, but noticeable.
Does anybody please know how to fix it?
Thank you.

[Mylenium]

Without seeing your code nobody can tell you much. This simply looks like you are using some code that uses dynamic alignment/ padding and the internal logic is simply one frame off. Eitehr that or you are using a font that produces alternate glyphs. in the latter case you could at least try and turn these options off in the character palette. Anything else will require proper details.

Mylenium

[Ondrej5FCA]

Sorry for the lack of detail. 
The whole expression I'm using goes like this:

rate = -1;
clockStart = 31;

clockTime = Math.max(clockStart + rate*(time - inPoint),0);

t = Math.floor(clockTime);
min = Math.floor((t/3600)/60);
sec = Math.floor(t%60);

Compisition has relular settings, 1080p 25fps.

[Mylenium]

Get rid of the Math.max. in this context it doesn't make any sense. To convert fractional values use Math.round or use the built-in timeToFrames() method.

Mylenium

[Ondrej5FCA]

The Math.max() function was used to fix the final zero in place.. And even when I deleted it, the glitches remained.

[Mylenium]

Check your font as already mentioned. The code appears to work just fine.

Mylenium

[Ondrej5FCA]

I've tried several different fonts with various settings. Always the same result.

[Ondrej5FCA]

Truth to be said, in a completely blank, new project it works just fine even with the same font.

[Dan Ebberts]

Is there a Tracking Animator, an animated mask, or a track matte involved?

[Ondrej5FCA]

None of the mentioned in this text layer. In terms of the whole composition, yes. But all the mattes don't interfere with this text layer.

[Dan Ebberts]

Any Source Text keyframes around the time of the glitch?

[Ondrej5FCA]

Nope, no keyframes at all. Only the expression. But the layer is attached via parenting tool to the blue box below, after the countdown it moves to the left.