Biology post-glomular blood question

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Post-glomerular blood has a higher protein concentration than venous blood due to the filtration process in the kidneys. The discussion highlights that post-glomerular blood passes through a second capillary bed, where additional water absorption occurs. This absorption can lead to a decrease in protein concentration in the venous blood. The participants emphasize the importance of providing all relevant information for accurate assistance. The initial analysis suggests a connection between water absorption and protein concentration changes.
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We are learning the excretory system, and are given a thinking assignment. Okay so we are given a bunch of values for concentration of the substances in the kidney. Basically the post-glomular blood (blood after being filtered by glomerulus) has a little more protien concentration than the venous blood (blood after being reconnected to the vein system in the kidney). Why is that?
 
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Okay I handed in the assignment already, I THINK I figured it out... here's what I put...

Basically I said the post glomerular blood goes through a second capilllary bed before it connects to the vein system. In that capillary bed there might have been some more water absorbed therefore the protien concentration decreases in the venous blood.

But I am probably wrong X_X...
 

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