Level cap on ranks in Research?

[TheFishyOne]

'ey, I'm a chanter who just hit level 16, and trained in Research. My first training point bought me 16 ranks in Research, but I could not train any more after that. Later on, when purchasing my Tome of Endless Enchantments, I checked my skills list and saw that Research was listed as being only skill level 5, and the 5 was colored red. Is this an indication that I need to increase in level further before I can really get into research, or is this something else altogether? I checked the Wiki, but it did not comment on this. Any help on this would be much appreciated.