# GRIN Block Propagation Problems

**URL:** https://forum.grin.mw/t/grin-block-propagation-problems/5681
**Category:** Mining
**Created:** [July 27, 2019, 8:08am UTC](https://forum.grin.mw/t/grin-block-propagation-problems/5681 "2019-07-27T08:08:34Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![Neo](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.grin.mw/neo/32/3365_2.png) [@Neo](https://forum.grin.mw/u/Neo)
#### Post date: [July 29, 2019, 8:38am UTC](https://forum.grin.mw/t/grin-block-propagation-problems/5681/3 "2019-07-29T08:38:16Z")

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I noticed your Network hashrate calculator doesn’t look right, it’s showing approximately double what it should be:

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/grin/original/2X/b/b85fa52e6cfeb8f20468a72478417d41725485eb.png)

From [Grinscan.net](http://Grinscan.net)

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/grin/original/2X/9/958637e6341f40933beb323028b3b10b01806cef.png)

Have you read this? [On cuckarood29 graph rates](https://forum.grin.mw/t/on-cuckarood29-graph-rates/5600) & [On dual PoW, Graph rates, gps, and Difficulty](https://forum.grin.mw/t/on-dual-pow-graph-rates-gps-and-difficulty/2144)

> [@On cuckarood29 graph rates](https://forum.grin.mw/t/on-cuckarood29-graph-rates/5600/2):
>
> The [changes](https://forum.grin.mw/t/mid-july-pow-hardfork-cuckaroo29-cuckarood29/5082) made to the new `ood29` resulted in a doubling of the rate of solutions compared to the old `oo29` . However, there are now 1/21 solutions per graph instead of 1/42 solutions per graph

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