A few possible reasons, or a combination thereof:
- Overall inconsistent driving or inexperience
- Brute forced qualifying laps with pace that can't be achieved during the race
- Racing on their strong combo after a set of weaker combos
- Infrequent Sport mode play leading to inaccurate ratings
- Smurfing and/or alternative accounts
- Recovering from DR/SR resets
- (For Race A only) Skewed ratings from roadcars/non-gr. races generally not being 'Rating bearing'
- (For Race A only) High rating drivers not losing DR to strong but lower rated drivers, making the difference more noticeable
But from my experience, the main reason is that they are too aggressive during battles and create situations where they are constantly losing time. They are not comfortable with working with another driver to catch someone or maintain faster overall pace, turning races into dogfights way too early. Instead of looking far ahead into the future and deciding which overtakes and defenses will be worth it
long-term, these drivers are focused on what position they are in
now, sacrificing any gap they had to the pack in favor of defending an unmaintainable place.
Other drivers can and will capitalize on that. Time loss compounds, especially in a group.
If they - for some reason - brute forced a qualifying lap and not acknowledged it, they may not have realized that they do not have the pace to fight in a conventional way (on-track). No matter what romanticism a person may have towards racing, they cannot fight tooth and nail for every position unless they have a significant advantage in fuel, tire, pace, etc.
Unfortunately, Sport mode does not seem to leave many opportunities for strategies other than consistent, unrelenting pace + an overcut or undercut.