Labelling offset not locking to end of line consistently

Question

I am creating a movie (animation) of seven unique lines that all have labels for titles that I am attempting to follow the lead head of the track. I have set the placement to "centred horizontal" and offset along line to "after end of line." However, as i manipulate the time plot the label will jump around and sometimes just constrain itself to the beginning of the line, then jump back to the end of the line at random intervals.

I have attempted to muck around with every possible combination through all the labelling settings, although it seems if i temporarily fix one track then the others won't follow suit.

Also mucked around with some of the line properties, but no luck.

I am using ArcGIS Pro Version 3.5.2

Any help with this would be much appreciated.

JesseWickizer · Answer

Are the lines comprised of individual segments with their own time stamps such as with animal tracking? And is the label the same for every line segment? If so, ensure Line connection is checked on so Maplex treats all the individual line segments as one contiguous line.

isaacosmond · Answer

My feature weight is set to 0 for all lines within the file, and there are currently no other layers active in the project.

RTPL_AU · Answer

Hi @isaacosmond 
Something else I thought of - do any of the other layers in the map perhaps have a feature weight set so labels will try to avoid them?