If you are a Woocommerce users then you know that Woocommerce provides a random ID/number to orders. For example, In below screenshot you can notice the random change in order ID/numbers.
The order ID/Number is determined by dynamically, Every order is stored in post table so post table ID is used as order ID/Number. Having sequential order number actually helps easy store management, If you are using Bank deposit payment options then order ID/number is required to be set as payment reference.
To set order numbers in sequential then install the following Woocommerce plugin - WooCommerce Sequential Order Numbers
There is no settings for this plugin. If your store doesn’t have any previous orders then the order ID/number will start from
#1 and increase sequentially. If your store already has some orders then the subsequent orders will increase order ID/number from the last order before activating the plugin. For example in my case it was $150 and next orders increased sequentially from
#150. See the screenshot below