Mode statistic strange behavior

I've attached an example protocol that calculates the median and mode for a set of data. The MODE statistics appears to be way off. For example, for molecular weight, the mode would be 440 or 460 (or 450 if it were averaged), but the reported mode is 163. Likewise, the PSA mode should be 90, but it is reported as 49.7.

Could someone have a look?

Lee