Relation between Ig levels cover dynamic process not static. So in different stages your observations could be different depending on your patients immune status, disease progress, treatment, other diseases etc etc.
"Specific IgG antibodies are produced during an initial infection or other antigen exposure, rising a few weeks after it begins, then decreasing and stabilizing."
“IgG and IgM levels showed no consistent relationship with metabolic abnormalities. Increased serum IgA levels were found in individuals with almost any component of metabolic syndrome, i.e. abdominal obesity”
“Serum IgA levels tended to increase in parallel with alcohol consumption. IgG and IgM levels did not increase with alcohol consumption. Indeed, IgG levels tended to be lower in moderate consumers than in abstainers”