There actually is a negative 2.4σ anomaly in the electron anomalous magnetic moment. The difference between the measurements and the Standard Model predictions is of about [-87 ± 36] 10^-14. I unfortunately cannot find any reference right now, but this paper and references there in will do the job.

This should be combined with a long-standing positive deviation, that now reaches 4.2σ, in the muon anomalous magnetic moment. The difference between experiment and theory reads [251 ± 59] 10^-11 (please see here or the above paper). To make the whole story funnier, the BMW collaboration released new predictions two years ago, that reduced the tension and even eliminated the need for new physics to explain the deviation. Their results of course still need to be confirmed independently.

In short, there is a guarantee of a lot of fun with leptons ;)