How about quarrelsome, intransigent, uncompromising, inflexible, or unyielding?

M-W:

quarrelsome: apt or disposed to quarrel in an often petty manner

intransigent: characterized by refusal to compromise or to abandon an extreme position or attitude : uncompromising

uncompromising: not making or accepting a compromise : making no concessions : inflexible, unyielding

inflexible: rigidly firm in will or purpose : unyielding

unyielding: characterized by firmness or obduracy; characterized by lack of softness or flexibility

Each of these common all too common traits results in interpersonal difficulties, but not ones that are (necessarily) impossible to overcome. They often all too often end in the kind of failure you describe:

Several quarrelsome OR intransigent OR uncompromising OR inflexible OR unyielding coworkers caused the project to be delivered late.

How about quarrelsome, intransigent, uncompromising, inflexible, or unyielding?

M-W:

quarrelsome: apt or disposed to quarrel in an often petty manner

intransigent: characterized by refusal to compromise or to abandon an extreme position or attitude : uncompromising

uncompromising: not making or accepting a compromise : making no concessions : inflexible, unyielding

inflexible: rigidly firm in will or purpose : unyielding

unyielding: characterized by firmness or obduracy; characterized by lack of softness or flexibility

Each of these common all too common traits results in interpersonal difficulties, but not ones that are (necessarily) impossible to overcome. They often end in the kind of failure you describe:

Several quarrelsome OR intransigent OR uncompromising OR inflexible OR unyielding coworkers caused the project to be delivered late.