As previously mentioned this happens when the Leader Line cannot be created in the Example below this is when the Leader Line is not added in the Tag and replicates your Example
Selecting the MRA shows the Leader Line Position in relation to its host

Uncheck Leader Line in Properties Palette

You now see something similar to your either there is not leader line as it is turned off OR it cannot be created as there is not enough space to fit it in

Most of the MRA Tags are Center Aligned so if you make sure you lick Far enough away you should be okay when using Leaders with Tags.
To ensure a Leader Line always is placed you really need additional MRA Tags where the Text is Left Aligned or Right Aligned so you can pick the exact start of text placement point

However in Revit 2025 you now have an Alignment Tool which solves Much of this for you

Jay Colcombe
Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering
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