Tracking font issues

Without any details about actual font settings, text animators, expressions and whatever else may be at play we can't really tell you much. From the look of it you definitely have adjusted some tracking/ kerning setting and that may simply not work well in conjunction with some other animation. also, does this occur with other fonts as well?

Mylenium

In some frames?  You mean it suddenly jumps from frame to the next and back again?  Or does the issue occur when you scale it and stay that way?

The difference between the two picture leads me to believe you are somehow scaling the font size rather than the text layer.

Are you using expressions?

Please give workflow details.

Maybe try resetting preferences

o restore the default preference settings, press and hold the following keys while the application is starting.

• Ctrl+Alt+Shift (Windows)
• Command+Option+Shift (Mac OS)

To restore default keyboard shortcuts, Alt-click (Windows) or Option-click (Mac OS) the OK button.

To reset background preferences, follow these steps:

MacOS

1. Go to your desktop and click GO on the menu bar.
2. Select Go to Folder from the drop-down and type the following path: /library/application support/adobe/.
3. Open Documents folder and select the folder named Adobe.
4. Rename the After Effects folder as ’OldAfterEffects’.

Windows

1. Access the path C:\Users\”username” \AppData\Roaming\Adobe. OR
2. In the Run command (Win key+R) dialog, type %appdata%
3. Open the folder named Adobe.
4. In the folder, select the After Effects folder and rename it as ’OldAfterEffects’. OR
5. Access the path C:\Users\”username”\Documents\Adobe and rename the After Effects folder as ’OldAfterEffects’.