Make sure the footprint you are using actually fits the physical part you are planning on using. You can:
- Measure the part and compare to your footprints.
- Compare the datasheet to your footprints.
- print the footprint out at 1:1 scaling and put a component on the paper and visually confirm.
- If you are comfortable using (or wanting to learn) FreeCAD, follow this FAQ: Tutorial: How to check footprint correctness? (Workaround for missing features in KiCad V5 and earlier)
- Some or all of the above.
Getting a footprint that works in layout is all well and good, but if it doesn’t match your planned part it is useless. This is much more important with SMT parts that don’t have long legs that can be bent into tortuous shapes to fit an erroneous footprint.