My gutter is installed to the pergola recently and when it rains,the water flows out of the gutter.It’s lurching to the outside
Welcome to the Bunnings Workshop community @Pwsingh. It's great to have you join us and many thanks for your question.
The number of gutter brackets could be inadequate to hold the guttering up under the additional weight of the water. The maximum gap between gutter brackets should not be more than one meter. If there is no bracket placed on that central rafter, then I would suggest addition brackets need to be installed.
Alternatively, the fall of the gutter might not be sufficient. You'd want at least 20mm fall over a 4-meter span.
Can you please let us know if every rafter has a bracket and how far apart the current brackets are. It might also be worth getting up there to confirm whether the bracket has bent down or if the top fixings have pulled out of the rafter. It could be difficult to check the fall on the gutter, but if you measure from the top of the gutter down to the ground at both ends, it might show if there is inadequate fall.
Thanks Mitchell, I’ll try doing that and will let you know the update,much appreciated, thanks