How to resolve the residual versus predicted quantile devation (Dharma plot)?

[rahulravi777]

I have been trying to perform beta regression modeling with random effects. I have sex ratio as the response variable, and climatic variables + years (1970-2021) as predictor variables. Different farms were used as random effects

But the residual plot shows significant quantile deviation. May I know why it is happening?

1. The predictor variables were standardized
2. No transformation of response variable

Thanks