Coldfusion page executed twice - iis

Question

Hi I am having a strange problem. On our development server coldfusion pages are executed twice. This happens everytime. To find out what is causing this issue, I send an email containing the request details to myself like this:
<Cfmail from="*" to="*" type="html">
<cfdump var=#GetHttpRequestData()#>
#gettickcount()#
#createUUID()#
</cfmail>
I get the following response when calling a page containing .cfm:
content [empty string]
headers struct
TOMCATCGIHTTPURL000000006A6B0000 /test.cfm
accept */*
content-length 0
host *
user-agent curl/7.40.0
method GET
protocol HTTP/1.1
1590760731452
C7487929-D679-B029-6E236DEE7E19B8EB
and a second mail containing
content [empty string]
headers struct
X-Original-URL /test.cfm
accept */*
content-length 0
host *
user-agent curl/7.40.0
method GET
protocol HTTP/1.1
1590760731425
C7487814-FA6F-4699-182C2E7382A06A47
Now the really strange part. When i call an index.cfm without the filename like / the page is only executed once. For example calling a page located on /test/index.cfm as /test/ returns as single response:
content [empty string]
headers struct
X-Original-URL /test/
accept */*
content-length 0
host *
user-agent curl/7.40.0
method GET
protocol HTTP/1.1
1590762636945
C86B3A74-025F-6DBA-EA187DFEF7751F03
Details of environment: Windows 2016 server, IIS 10, Coldfusion 2016
Any thoughts on what is causing this issue.
UPDATE
I use rewrite rules. I tested disabling the rewrite rules (as suggested by Miguel-F) and then the page is executed only once. When adding a simple rewrite rule like this the page is executed twice:
<rule name="Test rule" stopProcessing="true">
<match url="^(.*)$" />
<action type="Rewrite" url="/{R:1}" appendQueryString="true" />
</rule>
This behavior only occurs on our development server. Our production server has none of these issues and also runs on windows 2016 IIS 10 and coldfusion 2016.
Coldfusion version for development server: 2016.0.13.316217 (Production server runs on exactly the same version and has no issues)

Answer 1

This is not really an answer, but a really long comment.
You need to find out if this is one request or two. Add in some code like this:
<cfparam name="request.count" default="0">
<cfset request.count++>
<Cfmail from="*" to="*" type="html">
<cfdump var=#GetHttpRequestData()#>
Request.count: #request.count#
<br />
#gettickcount()#
#createUUID()#
</cfmail>
If the file was requested twice, each email will say 1
If the file is being included somehow, then then second email will say the request count is 2