Warning about shuffle=True despite having shuffle=False in multiple val_dataloader with CombinedLoader

[ashutoshml]

🐛 Bug

When working with multiple val_dataloaders with CombinedLoader, the following warning is displayed, despite having shuffle=False

Warning: 
Your 'val_dataloader' has 'shuffle=True', it is strongly recommended that you turn this off for val/test/predict dataloaders.

To Reproduce

Colab: https://colab.research.google.com/drive/14R9IzJN7xazG1wudz-bnF1LBsmD7vgVt?usp=sharing

Expected behavior

No warnings should be displayed

Environment

• CUDA:
  • GPU:
    • Tesla K80
  • available: True
  • version: 11.1
• Packages:
  • numpy: 1.19.5
  • pyTorch_debug: False
  • pyTorch_version: 1.10.0+cu111
  • pytorch-lightning: 1.5.4
  • tqdm: 4.62.3
• System:
  • OS: Linux
  • architecture:
    • 64bit
  • processor: x86_64
  • python: 3.7.12
  • version: Proposal for help #1 SMP Sat Jun 5 09:50:34 PDT 2021

cc @justusschock @awaelchli @ninginthecloud