The most likely explanation is: Substandard developing circumstances. Color film processing is a bit more demanding than its black & white counterpart. First, all the chemicals of the process must be operating at full potency. Second, the time/temperature specification of the process must be strictly followed.

The timing and temperature of the developer is based on the film’s infusion rate. The blue sensitive emulsions are on top, followed by the green emulsions; the red emulsions are underneath. The temperature determines the scope of the swelling of the gelatin binder. This controls the diffusion rate. If the diffusion rate is not at specification, one or more of the emulsion layers will be over or under developed.

The cyan, magenta, and yellow dyes are nearly colorless until developed. They blossom to full color only if conditions are right. These dyes are highly pH dependent, particularly the cyan dye. If the pH is wrong, the cyan dye is scrawny and this results in a warm color balance.

The bleach-fix (or bleach) must do its job to completion, otherwise metallic silver remains and veils the colors. The bleach action is dependent on the presence of dissolved oxygen in the waters of the bleach. This oxidizes the iron component giving the fluid its red coloration. Also, the pH is critical lest the cyan dye reverts to its leuco (colorless) state.

Although your film problem is difficult to diagnose, I suggest re-bleaching. This might help your film by reviving the cyan dye, and this, hopefully, will improve the color balance.