Latent Growth Model in AMOS: Positive path coefficients but a negative avg slope?

Hi Everyone - I have a latent growth model with the intercept and slope predicting 7 equally-spaced measurements of a continuous variable. The model fit is acceptable (CFI = 0.988, RMSEA = 0.037). The standardized regression weights between SLOPE and each measurement point are positive, yet the Slope intercept estimate is negative (and significant). How is this possible, and how should it impact the interpretation of the Slope intercept? Thank you in advance for your help!