Is it normal for the MAPE value to be too large？

[yaya-eng]

Hello, I made a prediction on dataset ETTH1 using your code, and the results of mae and mse are similar to those in the paper. I have two questions to ask.

1. The result of MAPE calculation in multivariate prediction is approximately 8-9 (but ideally it should be a number between 0 and 1). Later, I calculated the map e of the OT variable separately as 0.128, but the map e values of other variables are relatively large. Is this reasonable?
2. It was found that both MAE and MSE were calculated using normalized data. Should we use the data before normalization for calculation?