earnings amount changes, or did I see things?

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I think it be appropraite if mylot notifies us or at least keep the history of our earnings. I log in and check my earnings and see my each day earnings. but a few days later, I notice on some days my earnings were not the same anymore. For example, I remember seeing Several $1.10 or more earnings for each day. But today I only see that my earnings of more than $1. was listed for only two days. If only mylot can leave the history, so I don't think I am going crazy or something. I remember seeing it but now it dissapear, am i hallucinating?