Understanding Society User Support

Hello!

For our project we are working with wave 18 of BHPS and wave 1 of UKHLS. In these datasets we are using cross-sectional and design weights, respectively. At first we have simply appended the weights, but we've just noticed that the two have drastically different support. Cross-sectional weight from wave 18 ranges from 0 to 5.3, while design weight from wave 1 ranges from 0 to 6015.3. Could you please help us understand the difference and suggest ways to make them on a similar scale?

Thank you!

Best,
Nurfatima Jandarova